perf(api): 优化会员创建接口并发处理

- 在 ApiMemberController 的 createMember 方法上添加 synchronized 关键字
- 通过添加同步

ff-game/src/main/java/com/ff/api/controller/ApiMemberController.java

@@ -92,7 +92,7 @@ public class ApiMemberController extends BaseController {
      */
     @PostMapping("/create")
     @Transactional
-    public AjaxResult createMember(@Validated @RequestBody MemberCreateApiRequest memberCreateApiRequest) {
+    public synchronized AjaxResult createMember(@Validated @RequestBody MemberCreateApiRequest memberCreateApiRequest) {
 
         IGamesService iGamesService = gamesService.get(memberCreateApiRequest.getPlatformCode() + Constants.SERVICE);
         ApiException.notNull(iGamesService, ErrorCode.PLATFORM_NOT_EXIST.getCode());